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                            <div style="color:gray; word-break: break-all; font-size:12px;">原英文版地址: <a href="https://www.elastic.co/guide/en/elasticsearch/reference/7.7/analysis-porterstem-tokenfilter.html" rel="nofollow" target="_blank">https://www.elastic.co/guide/en/elasticsearch/reference/7.7/analysis-porterstem-tokenfilter.html</a>, 原文档版权归 www.elastic.co 所有<br/>本地英文版地址: <a href="../en/analysis-porterstem-tokenfilter.html" rel="nofollow" target="_blank">../en/analysis-porterstem-tokenfilter.html</a></div>
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<h2 class="title">
<a id="analysis-porterstem-tokenfilter"></a>Porter stem token filter<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/analysis/tokenfilters/porterstem-tokenfilter.asciidoc">edit</a>
</h2>
</div></div></div>

<p>Provides <a class="xref" href="stemming.html#algorithmic-stemmers" title="Algorithmic stemmers">algorithmic stemming</a> for the English language,
based on the <a href="http://snowball.tartarus.org/algorithms/porter/stemmer.html" class="ulink" target="_top">Porter
stemming algorithm</a>.</p>
<p>This filter tends to stem more aggressively than other English
stemmer filters, such as the <a class="xref" href="analysis-kstem-tokenfilter.html" title="KStem token filter"><code class="literal">kstem</code></a> filter.</p>
<p>The <code class="literal">porter_stem</code> filter is equivalent to the
<a class="xref" href="analysis-stemmer-tokenfilter.html" title="Stemmer token filter"><code class="literal">stemmer</code></a> filter’s
<a class="xref" href="analysis-stemmer-tokenfilter.html#analysis-stemmer-tokenfilter-language-parm"><code class="literal">english</code></a> variant.</p>
<p>The <code class="literal">porter_stem</code> filter uses Lucene’s
<a href="https://lucene.apache.org/core/8_5_1/analyzers-common/org/apache/lucene/analysis/en/PorterStemFilter.html" class="ulink" target="_top">PorterStemFilter</a>.</p>
<div class="section">
<div class="titlepage"><div><div>
<h3 class="title">
<a id="analysis-porterstem-tokenfilter-analyze-ex"></a>Example<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/analysis/tokenfilters/porterstem-tokenfilter.asciidoc">edit</a>
</h3>
</div></div></div>
<p>The following analyze API request uses the <code class="literal">porter_stem</code> filter to stem
<code class="literal">the foxes jumping quickly</code> to <code class="literal">the fox jump quickli</code>:</p>
<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console">GET /_analyze
{
  "tokenizer": "standard",
  "filter": [ "porter_stem" ],
  "text": "the foxes jumping quickly"
}</pre>
</div>
<div class="console_widget" data-snippet="snippets/969.console"></div>
<p>The filter produces the following tokens:</p>
<div class="pre_wrapper lang-text">
<pre class="programlisting prettyprint lang-text">[ the, fox, jump, quickli ]</pre>
</div>
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<div class="section">
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<h3 class="title">
<a id="analysis-porterstem-tokenfilter-analyzer-ex"></a>Add to an analyzer<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/analysis/tokenfilters/porterstem-tokenfilter.asciidoc">edit</a>
</h3>
</div></div></div>
<p>The following <a class="xref" href="indices-create-index.html" title="Create index API">create index API</a> request uses the
<code class="literal">porter_stem</code> filter to configure a new <a class="xref" href="analysis-custom-analyzer.html" title="Create a custom analyzer">custom
analyzer</a>.</p>
<div class="important admon">
<div class="icon"></div>
<div class="admon_content">
<p>To work properly, the <code class="literal">porter_stem</code> filter requires lowercase tokens. To ensure
tokens are lowercased, add the <a class="xref" href="analysis-lowercase-tokenfilter.html" title="Lowercase token filter"><code class="literal">lowercase</code></a>
filter before the <code class="literal">porter_stem</code> filter in the analyzer configuration.</p>
</div>
</div>
<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console">PUT /my_index
{
  "settings": {
    "analysis": {
      "analyzer": {
        "my_analyzer": {
          "tokenizer": "whitespace",
          "filter": [
            "lowercase",
            "porter_stem"
          ]
        }
      }
    }
  }
}</pre>
</div>
<div class="console_widget" data-snippet="snippets/970.console"></div>
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